docs: def handle(cls, vm, args):
          """
          Setup forwarding connection to given VM and pipe docker cmds over SSH.
          """
          docker = Iaas.info(vm)
          if not docker:
              raise Exception('docker vm %s not found' % vm)
  
          if docker['state'] != 'running':
              Iaas.start(vm)
  
          # XXX
          remote_addr = docker['ifaces'][0]['ips'][0]['ip']
  
          port = unixpipe.setup(remote_addr, 'root', '/var/run/docker.sock')
  
          os.environ['DOCKER_HOST'] = 'tcp://localhost:%d' % port
          cls.echo('using DOCKER_HOST=%s' % os.environ['DOCKER_HOST'])
  
          subprocess.call(['docker'] + list(args))